Shrimp pond polyculture
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The principle of polyculture of shrimp and shellfish is based on the principle of different physiological and ecological conditions between shrimp and shellfish. According to the characteristics of shellfish filtering, full use of shrimp baits, plankton, benthic organisms and micro-organisms, the implementation of polyculture of shrimp and shellfish, is conducive to the adjustment of ecological balance, promote the growth of all varieties, improve and purify water quality, achieve mutual benefit and symbiosis. purpose. Last year, in Binhai County, Jiangsu Province, 5700 mu of mixed shrimps and variegated clams were harvested, 4800 tons of variegated clams were harvested, and 125 tons of prawns were harvested, which achieved good economic and social benefits. The eco-agricultural technology model is suitable for promotion in the mudflats of shrimp ponds with hard mud or sand mud. The technical points are as follows: 1. Selection and sizing of shrimp ponds 1. Water quality The water source requires no sewage injection near the shrimp ponds. The specific gravity of seawater is between 1.010 and 1.022, the water temperature is 5°C to 35°C, and the pH value is 7.5 to 8.3. The source of water is mainly natural tides. 2. The topography and bottom quality require a flat terrain with small slopes to facilitate flooding and drainage. The bottoms are preferably hard clay or sand mud. 3. Area and depth The pond area should be around 100 mu. The depth of the shrimp pond should be about 150 cm to 250 cm, and the water level should be 100 cm to 150 cm. The minimum requirement is 60 cm to 70 cm. 4. Organize the shoal of the inner tidal flat on the pond. Generally 3 to 5 meters wide, 50 to 80 centimeters high and 60 to 70 centimeters wide, for planting and daytime management. About 10 days before transplanting, raise the earthworms and soak them in water for 2 days to 3 days. Then drain the water to wipe the light, and prevent the growth of the moss, which will facilitate the seed attachment and growth. In general, the scorpion and the scorpion are raised and the squats are used as bait stations. The proportion of the area occupied by shrimp ponds is 20% to 25%. 5. Before clearing the shrimp ponds, the silt, residual baits, and dried surface of the mudflats in the ponds should be removed before stocking, and then the water can be disinfected with drugs. You can use 20ppm of tea cake or quicklime 350ppm or bleaching powder 60ppm to disinfect. After the shrimp ponds are dredged, decontaminated, and poisoned, they are filtered with a 60- to 80-mesh sieve, into a washing pool to prevent entry of various pests. Second, the seedlings sowing 1. Sowing time generally begins in the middle of March in the lunar calendar, until the end of April, usually after the first shrimp, in order to prevent shrimp from damaging shrimp. 2. The stocking density is generally set at 8000 grains/kg to 12,000 grains/kg seedlings of 30 kg to 50 kg, and shrimps should be placed at 10,000 to 15,000 tails per acre. 3. Seeding method When sowing seedlings, the open space on both sides of the earthworm leave 10 cm to 20 cm, for the seedlings to move burrowing, so as not to enter the ditch. Water storage sowing seedlings, water level 15 cm ~ 20 cm, sowing seedlings strive for uniformity, should not be broadcast in the hot sun, rainstorm seedlings. Third, the production and management 1. Fertilization of bait seedlings after sowing or shrimp stocking before the application of base fertilizer bait Plankton. Mushi manure (chicken manure) 50 kilograms, urea 10 kilograms, so that the water in the pool becomes green or light brown. After the shrimps are released, look at the color of the water and apply the fertilizer once every half month. Apply urea and superphosphate mixed fertilizer 1ppm to 1.5ppm (ratio 2 to 3:1). Dissolve and spray on the surface of the water. In August, when the water temperature rises and the food in the pond is rich, the fertilization is stopped, and the shrimp continue to top-dress after catching it. 2. Timely watered shrimp seedlings began to gradually add water 15 days to 20 days after stocking, timely replacement of new water after heavy rain, increase the amount of water in the middle and late breeding period, the shrimp water level after the shrimp collection fell to 30 cm to 40 cm. 3. Clearing Brassica camphora In early June and late October, Brassica camphora can be easily propagated in Brassica camphora, affecting the normal production of seedlings. You can choose morning or evening during the ebb tide to dry and pick up the fish. 4. The shrimp ponds are mainly fed fresh bait or artificial bait. Adhere to regular fixed-point feeding, to prevent the lack of feeding, prawns to pick up seedlings, affect the growth and survival of seedlings. 5. Clearing the fields and preventing damages Between July and August, select the afternoon drainage during the tidal period during the tidal period, dry the dew for 2 hours to 3 hours, and use 10 ppm to 15 ppm of tea cake poison fish (enemies). After 1 hour to 2 hours, replace the fresh seawater with high tide as soon as possible, and replace the broken sieve. Each month, feed 1% oxytetracycline or furazolidone baits for 2 days to 3 days to prevent and treat shrimp disease. Fourth, the collection of seedlings after 7 months to 8 months of aquaculture, after the shrimp is harvested, fertilization to promote fertilizer for two weeks to about 1 month, you can drain collection.